Question

a can a piece of work in 15 days and b alone can do it in 10 days. b works as it for 5 days and then leaves. A alone can finish the remaining work in?

Answer 1

A=1/15   and b=1/10

b works at it for 5 days and then leaves.hence from this we came to know that A and B worked together for 5 days and then b left away.Let us assume that A has worked for 'x' days after B left and completed the work.If work is completed then the equation will be equal to 1.

5((1/15)+(1/10))+x(1/15)=1

from this we get x= 2.5 days.Hence A took 2.5 days furhet to complete work after B has left